Table 4 Comparison of program running times of different algorithms.

From: Least squares reverse time migration imaging with illumination preconditioned based on improved PRP conjugate gradients

Algorithm

Program running time of 30 iterations/s

PRPCG-LSRTM

153,061.953812

IPRPCG-LSRTM

153,061.953812

IPRPCG-IP-LSRTM

116,954.638908

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